1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
riadik2000 [5.3K]
3 years ago
10

All isotopes of technetium are radioactive, but they have widely varying half-lives. If an 800.0 g sample of technetium-99 decay

s to 100.0 g of technetium-99 in 639 000 y. What is it's half-life?
Mathematics
1 answer:
erica [24]3 years ago
3 0
The formula for A = Ao (1/2) ^ t/h
So sub in.
100 = 800 (1/2) ^ 639,000/?
That's all i can do lol

You might be interested in
If four times the sum of a number and 3 is divided by 2, the quotient is 0: find the number
AveGali [126]

The other number is -3.

Step-by-step explanation:

Step 1; First we develop formulae for the given information. A number is added with 3 and the resulting sum is multiplied by 4. This number is then divided by 2 and the quotient is 0. Assume the unknown number is x, then the given information is as follows

The quotient of \frac{4(x+3)}{2} is 0. So \frac{4(x+3)}{2} = 0.

Step 2; Now we solve the above equation. The denominator is taken to the RHS and the RHS remains zero.

\frac{4(x+3)}{2} = 0, 4(x+3)= 0, 4x+ 12 = 0, 4x = -12, x = \frac{-12}{4} = -3.

So the other number is -3.

3 0
3 years ago
Find the area of the irregular figure. I don’t know this I need help.
Shkiper50 [21]

Answer:

11 in.²

Step-by-step explanation:

you can divide the shape into 2 rectangles and then you solve for the 2 rectangles and then you add them up.

4 0
2 years ago
10 points!!!!!?!!!! Tyrone wants to know how much wrapping paper is needed to cover a box with the dimensions shown
Leviafan [203]

Answer: B.54 Square inches

Step-by-step explanation:  Surface Area

= 2(lb + bh + lh)

= 2(6 x 3 + 3 x 1 + 6 x 1)

= 2(18 + 3 + 6)

= 2(27)

= 54 square inches

7 0
2 years ago
Choose yes or no to tell if the digit in the hundreds place is 1/10 the value of the digit in the thousand place. 8,556 , 6,855
Brut [27]
The answer is yes cause it has to be between 1-10 no bigger than just in between 1-10
6 0
2 years ago
Read 2 more answers
I need help with 10 11 and 12 PLEASEEEEE
Anit [1.1K]

Answer:

Angle 6 is 42 degrees

Angle Q is 56 degrees

Angle is 74 degrees

Let me know if this helps :)

4 0
3 years ago
Other questions:
  • A 2 liter bottle is filled completely with water from a faucet in 10 seconds. How much water was filled into the bottle each sec
    15·1 answer
  • if georgia is 59,424.77 square miles, then what is the area of georgia rounded to the nearest square mile?
    8·1 answer
  • Name the property that the equation illustrates. Explain. –0.3 + 0.3 = 0 A. Identity Property of Addition; 0 is part of the equa
    14·1 answer
  • Geometry help! this is my 2nd to last question
    6·2 answers
  • What is 60 times 20 plz answer and make it quick!!
    9·2 answers
  • Solve the system of equations. (1 point) 5x + y = 9 3x + 2y = 4 a (−2, 5) b (1, 4) c (2, −1) d (4, −4)
    9·1 answer
  • What is 9865324679965421567x 256788643335679075322356788
    14·1 answer
  • ) Simplify.<br> | – 15 – (-5)
    11·2 answers
  • After how many hours are 24.5 and 38 equal
    7·1 answer
  • What's the area of this? PLS HELP
    6·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!